| GemCad Ray Traces for RI = 1.76 | ||
 |
||
| Random Model | Cosine Model | ISO Model |
| Defibrillator I
Designed by Bob Keller December 2001 Bob Keller |
|
| A Simple Heart for Spinel, Garnet, Corundum | |
| Angles for R.I. = 1.76 | 39 facets + 15 facets on girdle = 54 |
| 1-fold mirror-image symmetry | 96 index |
| L/W = 1.007 T/W = 0.557 T/L = 0.553 P/W = 0.417 C/W = 0.158 | H/W = (P+C)/W+0.02 = 0.595 P/H = 0.701 C/H = 0.265 |
| Vol./W^3 = Vol./W^3 = 0.201 | Brightness at 0° tilt for RI = 1.76 COS = 78.2 ISO = 90.4 |
| Pavilion | |||
|---|---|---|---|
| cp | 38.00 | 14-31-65-82 | Cut to equal depth to make center point |
| 1 | 39.00 | 06-90 | Meet center point |
| 2 | 40.59 | 10-86 | Meet center point |
| 3 | 41.21 | 14-82 | Meet center point |
| 4 | 41.40 | 19-77 | Meet center point |
| 5 | 40.46 | 23-73 | Meet center point |
| 6 | 39.20 | 31-65 | Meet center point |
| 7 | 39.84 | 40-56 | Meet center point |
| 8 | 42.91 | 48 | Meet center point |
| g1 | 90.00 | 06-90 | Match 1, set size |
| g2 | 90.00 | 10-86 | Meet g1.1.2 |
| g3 | 90.00 | 14-82 | Meet g2.2.3 |
| g4 | 90.00 | 19-77 | Meet g3.3.4 |
| g5 | 90.00 | 23-73 | Meet g4.4.5 |
| g6 | 90.00 | 31-65 | Meet g5.5.6 |
| g7 | 90.00 | 40-56 | Meet g6.6.7 |
| g8 | 90.00 | 48 | Meet g7.7.8 |
| Crown | |||
| a | 33.08 | 06-90 | Match g1, establish upper girdle line |
| b | 34.65 | 10-86 | Meet g1.g2.a |
| c | 34.98 | 14-82 | Meet g2.g3.b |
| d | 36.40 | 19-77 | Meet g3.g4.c |
| e | 35.60 | 23-73 | Meet g4.g5.d |
| f | 35.97 | 31-65 | Meet g5.g6.e |
| g | 37.96 | 40-56 | Meet g6.g7.f |
| h | 40.00 | 48 | Meet g7.g8.g |
| i | 34.66 | 45-51 | Meet h.g8.g7.g |
| j | 31.40 | 27-69 | Meet f.g6.g5.e |
| j | 33.23 | 16-80 | Meet d.g4.g3.c |
| j | 32.31 | 08-88 | Meet b.g2.g1.a |
| j | 0.00 | Table | Meet l.a.a.1, l.b.c.k, others |
The Defibrillator I Design File is available for GemCad users.
I designed Defibrillator I for a (relatively) easy to cut heart for a pyrope garnet of rich color that's been banging around in my rough box for a while now. This design is pretty bright as hearts go and is a good match for medium to deep saturated materials with RIs in the spinel-garnet-corundum range.
Begin the pavilion by carefully cutting four facets on indexes 14-31-65-82 at 38.00° to equal depth to establish a centered culet point. These four center point "finder" facets get cut away as pavilion facets 1-8 are subsequently cut to meet at this center point. The simple faceting in the "head" area on Defibrillator I should be facilitating if you are into vee notching your hearts.
